Pump.



W. S. HOLDAWAY.

PUMP.

APPLICATION r1120 JAN. 15. 1913.

1,1 9 1 A23. I v Patented July 18, 1916.

WILLIAM s. nonnawnmor PROVO, UTAH, ASSIGNOIt TO THE H. 80 S. I'UMP COMPANY,

A CORPORATION OF UTAH.

IPUHP.

Specification of Letters Patent.

Patented July 1a 1916."

Applicatlon filed January 15, .1918. Serial No. 742,254.

To all whom it may concern:

Be it known that I, WILLIAM S. HOLDAWAY, a citizen of the United States, residing at Provo, in the county of Utah and State of Utah, have invented a new and useful Pump, of .which the following is a specification.

The invention relates to pumps particularly designed for forcing liquid, the device being of such a construction as to be also useful as a compressor.

One of the objects of the invention is to employ interfitting opposed screw conveyers which cooperate to trap independent bodies of fluid and to force said bodies longitudinally within the pump casing from the inlet to the outlet thereof.

A further object is to provide forcing means which operate positively to prevent the liquid under compression or being elevated, from flowing backwardly, the pump, as a result, being maintained primed under all conditions.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and 1n the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the inventlon.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings :-Figure 1 is a plan view of the pump, the top of the casing being removed. Fig. 2 is a front elevation of the pump. Fig. 3 is a section on line A-B Fi 1.

l leferring to the figures by characters of reference 1 designates a casing preferably made up of separate sections each of which extends throughout the length of the pump, the said sections being flanged, as at 2, and bolted or otherwise connected so as to prevent leakage therebetween. J ournaled within the heads or ends of the casing are shafts 3 and arranged on each of these shafts and within the casing are oppositely disposed similar screws 4 so shaped and proportioned that the convolutions of each screw will fit snugly between the convolutions of the other screw and extend up to the core or center of the screw. This has been clearly indicated in Fig. 1, The casing 1 fits snugly around the screws and up to the points on the peripheries thereof where said eripheries intersect, as shown in Fig. 3. (gears 5 are secured to the shaft 3 and are of the same size and constantly in mesh. -Thus it will be seen that the two screws will rotate at the same speed and in opposite directions and, consequently, separate compartments will be formed between the convolutions of each screw, as shown at 6, each compartment being constantly out of communication with the other compartments, such communicat on belng cut off by the adjacent convolut1on of the opposed screw.

It will be noted that one of the heads of the casing has thrust bearings which engage the ends of the shafts, thus relieving the head from all thrusts which might be exerted thereagainst by the screws, thereby preventing undue wear upon the heads and also permitting the pump to operate with less power than would otherwise be necessary.

An inlet 7 may be provided at one end of.

the casin and an outlet 8 at the other end thereof. ower may be transmitted to either of the shafts 3 and it will be apparent that when said shaft is rotated in one direction, the gears 5 will cause the other shaft to rotate in the opposite direction. Thus any fluid which may enter the inlet 7 and the compartments 6 registering therewith, will be forced longitudinally within the casing by the rotating screws and ultimately expelled through the outlet 8. As the compartments are at all times out of communication with the remaining compartments in.

the casing, it will be apparent that the fluid,

- after once passing between the convolutions of the screws, cannot be forced backwardly A pump including a casing having'sockets Q r memes in one head thereof constituting thrust-bearother head of the casing, the casing and ings, parallel shafts journaled within the screws forming separate non-communicating heads of the casing and bearing against and compartments between the convolutions of engaging said thrust bearings, a screw seeach screw, the screws and gears being com- 5 cured to and revoluble with each shaft, the letely housed in the. casing, there being an 20 I threads of one screwfitting snugly between mlet at one end of the casing and an outlet the convolutions of the threads of the other at the other end thereof.

screw, both screws extending up to said In testimonythat I claim the foregoing as head, said thrust bearings cooperating with my own, I have hereto aflixed my signature 10 the ends of the shafts to relieve the head in the presence of two witnesses.-

against thrusts from the screws gears secured to-the respective shafts and constantly 7 WILLIAM HOLDAWAY' meshing whereby the shafts are revoluble in Wltnesses:

opposite directions synchronously, said gears GEORGE D; 'MECHAM,

15 being interposed between the screws and the 1 LOGAN G. HoLDAwAY. 

